微型爆炸箔电爆炸过程的数值模拟

Numerical Simulation of Electrical Explosion of Micro-Exploding Foil

对微型爆炸箔开关的电爆炸过程进行合理简化,建立了微型金属箔电爆炸的数值模拟方法。通过自编的一维数值计算程序,对微型爆炸箔的电爆炸过程进行数值模拟,计算结果较好地再现了微型爆炸箔电爆炸过程,计算得到的爆炸电流和爆炸时间与实验结果偏差小于5%。计算结果表明,微型铜箔电爆炸产物的爆炸压力可高达2GPa,温度超过10 000K,电离度超过40%,通过数值计算,给出了对开关设计有重要影响的最小起爆阈值参数,并和实验结果进行了比较,获得了较为一致的结果。

A method was established for modeling the electrical explosive process of the micro metal foil based on reasonable simplification and a 1D code was developed to simulate the electrical explosive process of the micro metal foil. The numerical results agree well with the experimental data. Compared with the experimental results,the calculated exploding current and burst time are within a difference of 5 %. The calculated results show that the pressure of the exploding product can reach about 2 GPa, the temperature of the exploding product can exceed 10 000 K,and the degree of ionization is over 40%. Using this numerical method, we obtained the minimum exploding threshold of the voltage, which is important for the design of the micro-foil switch,and which was validated by the experimental results.